Steam for Linux

Has anyone used the GTX 650 Ti Boost on Linux (with the proprietary drivers)? If so, which manufacturer (ASUS, Gigabyte, …), and which desktop environment do you use?I've read about tearing problems with it on [1][forums.linuxmint.com] and [2][forums.linuxmint.com], and would like to know if there are people successfully using it, too.

I recently built a computer with EVGA 650 ti boost sc 2gb. It runs all the valve games great at the highest settings in 1980x1080 on ubuntu 12.04 with unity and I havent noticed any screen tearing issues so far.